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Memory Corruption Affecting vyper package, versions [,0.2.9)

0.0
medium

Snyk CVSS

    Attack Complexity High

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  • Snyk ID SNYK-PYTHON-VYPER-1252242
  • published 20 Apr 2021
  • disclosed 19 Apr 2021
  • credit Thomas Jay Rush
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Introduced: 19 Apr 2021

CVE NOT AVAILABLE CWE-787 Open this link in a new tab

How to fix?

Upgrade vyper to version 0.2.9 or higher.

Overview

vyper is a Pythonic Smart Contract Language for the EVM.

Affected versions of this package are vulnerable to Memory Corruption. A data handling issue exists with certain forwarder-style proxies deployed using Vyper's built-in create_forwarder_to function prior to the added support of EIP-1167 style forwarder proxies.

For data corruption to potentially arise, one would need all the following conditions to occur:

  • use of a forwarder-style proxy deployed using Vyper's built-in create_forwarder_to function;
  • there is a function that returns more than 4096 bytes; and
  • there is no data sanitation on the value returned.

The issue was patched when support was added for EIP-1167 style forward-style proxies.

References